hatton gabden



v, S w L. PERONI.

'v..'.-w.':T-herm0meter.

No. 222.420. Patented Dec. 9,1879.

Fig.2?

Fig.1.

N. PETERS. PHOTQ-LITHOGRAFHER, WASHINGTON. D (Iv UNITED STATES Liner PERONI, c1145 HATTON GARDEN, p JOSEPH HICKS, or's HA'ITON GARDEN, COUNTY OF MIDDLESEX, EN -q LAND.

HOLBORN, ASSIGNOR TO JAMES IMPROVEMENT m THIERMOMETERS.

Specification forming part of Letters Patent No. 222,420, dated December 9, 1879; application filed September 4, 1879; patented in England, January 24, 1878.

To all whom it may concern Be it known that I, LUIGI PERONI, of 45 Elatton Garden, Holborn, in the county of Middlesex, England, glass-blower, have invented new and useful Improvements in Thermometers, which improvements are fully set forth in the following specification, reference being bad to the accompanying drawings.

My invention has for its object improvements in the construction of glass-tubes em-' ployed in the manufacture of thermometers, whereby thermometers made of such tubes possess the advantage of magnifying the bore of the tube more than is the case with tubes sented to an enlarged scale at Figure I, manufactured with a section {consisting of a flat or horizontal base, al,two perpendicular sides, I), and a circular or curved top, 0, and in producingtubes of such section by drawing the circular or curved top 0 becomes connected with the sides b bysmall curves, d, which, by reason of the .bore being beyond the mechanical center or axis of such curves 01, act as magnifyin g curves or lenses, and thus magnify the appearance of the bore more than is the case with thermometer-tubes, made as heretofore, with the bore placed in the mechanical center or axis of the tube or of the curved portionof the tube. The tube is preferably made with the enameled ground or back at present in use. The bore is seen enlarged or magnified by a View thereof through the magnifying-curves d of the tube in the direction of .the arrows.

By forming the tubewith flat base a and sides b,the rollingof thermometers made therefrom is prevented, and conscquentlythe lia-- bility to breakage of the thermometer from such rolling is prevented or considerably les- At Fig. 2 I have represented to an enlarged scale a different section of tubing with my invention applied thereto. In this case the tube is mainly circular in section and the bore is in the center of the main portion thereof but the tube is formed with a curved portion, 0?, standing up above the general surface of the tube, and by reason of the bore of the tube being beyond the mechanical axis or center of such raised curved portion at the latter acts as a lens or magnifying-curve and greatly magnifies the appearance of the bore.

At Fig. 3 I have represented another section of tubing, in which the tube is circular in section; but, in consequence of the bore thereof being placed out of the center, the bore is enlarged in appearance.

At Fig. 4 I have represented another section OFFQQE. f

of tube, consisting of an oval or ellipse. -In

this case thebore may be placed in the center of the longitudinal axis of the oval or ellipse, as

shown, or it maybe placed at one side of such center, as shown at Fig. 5. The bore in this case is seen greatly enlarged or magnified by a view thereof through the longitudinal axis. of the oval or ellipse.

It will be evident that my invention maybe applied to other sections of tubes than those above referred to. I

Having thus described the nature of my said invention, and the mode in which I carry the same into effect, I would have it understood I that what I claim isy 1. A thermometer-tube having its bore out of or beyond the mechanical axis or center, as

and for the purpose described. 2. A thermometer-tube having its bore out of and beyond the center thereof, and a curved portion or portions, d,for magnifying said bore, substantially as set forth.

LUIGI- PERONI. Witnesses:

HENRY READING,

8 Hatton Garden, E. O'. O. M. WHITE,

23 Soathmnpton Buildings, London. 

